The effect of the spatial variation of the order parameter on the tunneling density of states of superconducting alloys

1966 ◽  
Vol 193 (3) ◽  
pp. 459-470 ◽  
Author(s):  
H. J. Juranek ◽  
L. Neumann ◽  
L. Tewordt
Keyword(s):  
Spatial Variation ◽  
Density Of States ◽  
Order Parameter

Density of states and order parameter in dirty anisotropic superconductors

1996 ◽  
Vol 54 (18) ◽  
pp. 13275-13287 ◽  
Author(s):  
Sergei V. Pokrovsky ◽  
Valery L. Pokrovsky
Keyword(s):  
Density Of States ◽  
Order Parameter ◽  
Anisotropic Superconductors

DENSITY OF STATES AND ORDER PARAMETER IN DIRTY SUPERCONDUCTORS WITH A WEAKLY BROKEN d-WAVE SYMMETRY

1996 ◽  
Vol 10 (12) ◽  
pp. 537-544 ◽  
Author(s):  
SERGEI V. POKROVSKY
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Density Of States ◽  
Order Parameter ◽  
Zero Temperature ◽  
Scattering Rate ◽  
Wave Symmetry ◽  
Direct Calculations ◽  
D Wave ◽  
Gapless Superconductivity

It is shown by direct calculations that in a superconductor with a slightly violated d-wave symmetry of the order parameter (OP) the impurity driven phase transition from the gapless superconductivity to a state with a finite gap takes place at zero temperature. The corresponding scattering rate is close to the value at which the superconductivity vanishes in the d-superconductor. The behavior of the transition temperature, the OP and the density of states (DOS) is analyzed. The model is plausibly relevant to the BSCCO 2:2:1:2.

Localization in the Hopping Disordered Bose Hubbard Model

1998 ◽  
Vol 12 (28) ◽  
pp. 1159-1166 ◽  
Author(s):  
K. Sheshadri
Keyword(s):  
Hubbard Model ◽  
Density Of States ◽  
Order Parameter ◽  
Singular Part ◽  
Low Energy ◽  
Strongly Correlated ◽  
Zero Temperature ◽  
Bose Glass ◽  
Dynamical Exponents ◽  
Approximation Calculation

The zero-temperature superfluid (SF)–Bose glass (BG) transition in the strongly correlated (U=∞) Bose Hubbard model in d dimensions driven by disorder in hopping is studied using a simple analytic technique. The transition is identified as the point at which the density of states for local rotations of phase of the superfluid order parameter is enhanced at the lowest energies. This identification leads to the values ν=2/d and z=d/2 for the correlation length and dynamical exponents, respectively, by an approximation calculation of the low-energy density of states for large d. At the transition, the singular part of the compressibility κ vanishes, so κ is finite.

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